Java.util.EnumSet.noneOf() Method

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Description

The java.util.EnumSet.noneOf(Class<E> elementType) method creates an empty enum set with the specified element type.

Declaration

Following is the declaration for java.util.EnumSet.noneOf() method

public static <E extends Enum<E>> EnumSet<E> noneOf(Class<E> elementType)

Parameters

  • elementType-- the class object of the element type for this enum set.

Return Value

This method does not return any value.

Exception

  • NullPointerException-- if elementType is null

Example

The following example shows the usage of java.util.EnumSet.noneOf() method.

package com.tutorialspoint;

import java.util.*;

public class EnumSetDemo {

   // create an enum
   public enum Numbers {

      ONE, TWO, THREE, FOUR, FIVE
   };

   public static void main(String[] args) {

      // create a set that contains all Numbers class
      EnumSet<Numbers> set1 = EnumSet.allOf(Numbers.class);

      // print set1
      System.out.println("Set1:" + set1);

      // create a second set which is empty
      EnumSet<Numbers> set2 = EnumSet.noneOf(Numbers.class);

      // print the new set
      System.out.println("Set2:" + set2);

   }
}

Let us compile and run the above program, this will produce the following result:

Set1:[ONE, TWO, THREE, FOUR, FIVE]
Set2:[]



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